Scheduling Tasks

  • 目的:使用Spring @Scheduled 每五秒钟打印当前时间
package com.example;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class ScheduledTasks {

	private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

	@Scheduled(fixedRate = 5000)
	public void reportCurrentTime() {
		System.out.println("The time is now " + dateFormat.format(new Date()));
	}
}
  • fixedRate
  • fixedDelay
  • @Schedule(cron = “…”) Reference
package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableScheduling
public class Application {

	public static void main(String[] args) throws Exception {
		SpringApplication.run(Application.class);
	}
}
  • @EnableScheduling: 确保background task executor创建

Code Demo

Spring Guides References